A security issue has been reported in Asterisk, which can be exploited by malicious people to bypass certain security restrictions.
The security issue is caused due to a problem within the AEL (Asterisk Extension Language) when generating switch extensions. Depending on the extension, an attacker may be able to guess and dial a special number, which could allow him to e.g. listen to the voicemails of other users.
Solution: Fixed in the SVN repository.
Provided and/or discovered by: Philipp Kempgen
Original Advisory: http://bugs.digium.com/view.php?id=9316
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Subject: Asterisk AEL Extensions Security Bypass
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